Assertion (A): | Concentration of certain ions significantly higher in the vacuole than in the cytoplasm of a plant cell. |
Reason (R): | In plant cells the vacuoles can occupy up to 90 per cent of the volume of the cell. |
1. | Both (A) and (R) are True and (R) is the correct explanation of (A) |
2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
3. | (A) is True but (R) is False. |
4. | (A) is False but (R) is True. |
Which of the following pair of organelles does not contain DNA?
1. | Nuclear envelope and Mitochondria |
2. | Mitochondria and Lysosomes |
3. | Chloroplast and Vacuoles |
4. | Lysosomes and vacuoles |
The osmotic expansion of a cell kept in water is chiefly regulated by:
1. Mitochondria
2. Vacuoles
3. Plastids
4. Ribosomes
1. | contains water, sap, excretory product and other materials not useful for the cell. |
2. | store enzymes capable of digesting carbohydrates, proteins, lipids and nucleic acids. |
3. | are formed by engulfing the food particles. |
4. | are important for osmoregulation and excretion. |